Sound Field Distribution Characteristics of Typical Kuroshio Front in Different Seasons

Abstract

As the Kuroshio front which is greatly affected by the seasonal variation, its sound field distribution also presents different characteristics in different seasons. In this paper, the sound speed profiles of the Kuroshio front are classified via fuzzy C-means clustering algorithm, and we use the BELLHOP ray model to calculate the sound field under the Kuroshio front environment in winter and summer. The results show that the Kuroshio front is strong in winter, and its location is southward, which has a great impact on the distribution of convergence area after passing through the frontal zone; In summer, the Kuroshio front is relatively weak, and the location of Kuroshio front is northward. When the location of the sound source is the same as that in winter, the frontal zone has a greater impact on the distribution of convergence area near the sound source. We also calculate and analyze the three-dimensional sound field under the Kuroshio front environment in different periods, which shows that there are obvious differences in winter and summer.